corliss



0. OORLISS. INSTRUMENT FOR ADDINGPIGURES.

No. 79,209. Patented June 23, 1868.

mtth totes strut first.

CHARLES, COR-LISS, OF HA VERlllLL, MASSACHUSETTS.

Lctters Patent No, 79,209, daied June 23, 1868.

"IFINSTBUHEHTS FOR ADDING FIGURES.

Be it known-that I, Cnsnu-zs Centres, of I'Ittt'llllll, in the county ofEssex, and State of Massachusetts, have invented a, ncti and usefulImprovement in Instruments for Adding Figures, Numbers, &-'c., of whichthe following is a full, clear, and exact description, reference beinghad to the accompanying drawings, making a part of this specification,in'vrlfiefh Figure 1 represents a front or plan view chad-instrumentembodying my improvement.

Figure 2 is a view of the instrument with the rear pla'tc removed.

Figure 3 is a rear view.

Figure 4 is a detail new of the ratchet-wheel and pawl.

. Figure 5 represents the method of holding the instrument when in use.

This invention is designed as an improvement upon a similar device, forwhich an application for a patent has been made by N. Spofi'ord andmy'self. I

The object of th'c present invention is. to substitute a dial toindicate the figures or numbers to be'added in the place 'of thegradnations marl-red on the sliding rod or bar employed in'theabove-mentioned device.

A'. further object is to provide a nieans for instantaneously resettingthe instrument after registering any required amount.

And the-invention consists in so arranging and connecting the slidingrod with an indicator moving upon a and placed at or near the lon'er endof the rear of the instrument, that each figure or number to be addedwill be indicated on the'said dial,.the indicator returning to the pointof rest upon each return of the sliding rod to its projected position.

The invention also'consists in the employment of a secondary pawl orclick, engaging irith a ratchet eonnected with the hand that designatesthe units, and so arranged in relation to the gearing'operating theindicutors, which register the amounts added, that by releasing the saidpawl, the spring, which is wound up in the process of adding, will'alsobe released, and thus cause the indicators to return to their originalposition.

" Referring to the drawings, A represents the main body of theinstrument, containing the working parts, and is a hollow projectingarm, containing the sliding red C, which latter is maintained in aprojected {position by means of a spring, suitably arranged within thesaid arm. ()n the inner end of the sliding bar C is a rack, C, whichengages with a. driving-wheel, b, and to which it imparts areciprocating rotary motion, 'as the bar is moved in and out of thecasing or arm B. The toothed or driving-wheel is hollowed out, and inthe space so formed is fitted n. ratchet-wheehf, which engages with apawl, 71-, and is so arranged as to be turned in one direction with thedriving-wheel, but is prevented from turning back with the same by meansof the pawl he.

a represents an additional pawl, pivoted to the main plate, and engagingwith the ratchet-wheel f, so as to retain the same in thcposition towhich it is advanced by the sliding rod. The driving-wheel b, which isoperated directly by the sliding bar, is made to gear with a wheel, e,to the spindle of which latter is attached the index-hand on the dial G,fig. 3, so that at each movement of the sliding bar 0, the saidindex-hand will he moved to any desired figure on the dinlG, and willreturn teits original position at each retraction of the said bar, andso the numbers are communicated from thc,dial designating the unitstothose denoting tens'and hundreds, in any well-known manner.

When the desired amount or number has been registered, and it isdesirable to reset the instrument, the thumb-piece or knob y is pressedin, which causes the retaining-pawl to release the ratchet wheel, and atthe same. time raises the moving puwl or click f, so as to allow-of thefree return-movement of the ratchet-wheel; The train of gearing isretracted by means of a coiled spring, g, which is wound up in theprocess of adding.

' The operation is as follows: The instrument being held in the hand, asrepresented in fig. 5, and the indicaters being in the several positionsshown in fig. 1, the lower end of the instrument, which may he providedwith a projecting point, 1), is placed at or near the figure or numberin acolumn to be added. The sliding rod is then pressed in by thefinger, until the hand on the dial G points to the'numbcr correspondingwith that at the end of the instrument in the column to be added."When-the pressure is removed from the sliding rod,-

letter will return to its projected position, and the indieator on the(11111 G will also return-to its original position, the amounts addedbeing registered on the dials D E F.

When the process is completed, and it is desirable to reset theinstrument, by simply pressing upon the knob g, the pawl a will releasethe ratchet f, and the indicators will return to the position shown infig. 1.

Having thus described myinvention, what I claim as new, and desire tosecure by Letters Patent, is-

IQ Operating the indicator designates thefigure' or number tobe added,by means of a sliding roll or bar, in such a manner that the saidindicator will return to its original position upon each retrnction'ofthe lOll or bar to its projected position. i

2. The simultaneous resetting of the severallindicntors, substantiullyasspecified; In testimonywhereof, I have signed my name to thisspecification in the piesence of two subscribing witnesses- CHARLESCORLISS.

Witnesses:

- J. H; ADAMS,

M. S; G. WILDE.

